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Crossfire question

Last response: in Graphics & Displays
July 17, 2012 5:55:55 AM

Hi everyone, I have a question regarding crossfire on different PCI-E bandwidths. I currently have a 6850 and I'm wondering if i get another one, will my current motherboard bottleneck it due to having only a x16/x4 lane?
Will it be a good upgrade? I'm planning to play Diablo 3, guild wars 2, and maybe some BF3 in the future.

Here are my specs:

windows 7 32 bit
core i5 3570k ( stock 3.4 ghz)
4 gb 1333 ram
HD Radeon 6850 1 gb
MSI Z77A-G43
Cooler Master 650W PSU


More about : crossfire question

July 17, 2012 5:57:58 AM

I will be playing at 1080p.
July 17, 2012 6:00:34 AM

good cpu motherboard and psu but why do you have a 32bit windows and only 4gb of 1333 before you buy the gpu upgrade these 2 things or maybe only the ram but upgrade it to 8gb of 1600 please before you get the next gpu
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July 17, 2012 6:14:17 AM

I've read that 4 gb of ram is enough for most games in the modern era. I will probably upgrade to 8 gb of 1600 when windows 8 comes out in the future.
July 17, 2012 6:57:24 AM

true but with windows 7 32bit your only using about 3.2gb of that ram
July 17, 2012 7:04:00 AM

wouldnt a GPU upgrade like CF 6850s be a bigger upgrade to gaming performance than 4 more gb of ram though?
July 17, 2012 7:39:32 AM

yes but 8gb is a little bit because 4gb is kinda small
July 17, 2012 7:06:53 PM

More than 4 gigs of RAM on 32 bit windows is a waste.
Money is better spent on another 6850.
You will see a small performance loss (~10-15% i think) on the x4 slot compared to running it on a x8 or x16 slot. Shouldn't be too bad - I would do it myself in your situation.

From some googling:

There are many misconceptions about the memory limit in 32-bit Windows OSes.

First of all, when I say RAM, this includes every kind of RAM. So not just regular, but also your video RAM.

The maximum available amount of RAM per process for a 32-bit OS is 2 GB. If you have a 64-bit OS, a 32-bit process can allocate up to 4 GB.

Additionally, the entire OS can only address 4 GB for every process combined, while 64-bit OSes can allocate 8 TB.

Also interesting is that this limit adds up to the paged pool. This means that a 32-bit OS cannot use more than 2 GB total, which means 6 GB for all applications including virtual memory. Of course, this has nothing to do with RAM, because the other 2 GB would be stored in the paging file, limited to your hard-drive's speed.
July 17, 2012 11:16:03 PM

Thanks, i read that the performance drop from to x16/4 isnt significant enough to hamper gameplay. I just wanted reassurance. Do you think i will be able to play most modern games at full 1080p max settings with Crossfire 6850s?
July 18, 2012 7:18:57 PM

I have 2 crossfired 6850s and they play everything at 1080p with Max or near max settings at 60fps with Vsync on. I hate it when the frames dip below 60 (even to 55fps) so I drop the graphics a little in some cases. I'm very happy with the results.
July 18, 2012 8:36:47 PM

do you encounter any driver issues or micro stuttering?
July 18, 2012 9:06:33 PM

I don't have any driver issues, I've had some issues when the driver install got messed up, but it was easily fixed. Some games dont have CF profiles for a couple weeks after they come out.

No micro stuttering, or if there is, I don't detect it, or it just doesn't affect me. Seems to work really well, better than 4870 CF that it replaced.
July 18, 2012 10:03:28 PM

thanks for the information regarding CF 6850, makes me more confident to just save some money and add another one to save some cash and not have to spend it on a GTX 670. I just hope i dont encounter the micro stuttering as well.